Abstract
Assessing the surgical level of epidural anesthesia is difficult. Several techniques have been proposed to assess the level even under general anesthesia. However, there are many factors that affect the level (i.e., time after injection, dosage and concentration of anesthetic, general anesthetic technique, and so forth) , and, thus, no perfect methods exist. Anesthesiologists should be aware of the possibility that sensory level or the depth of anesthesia is not sufficient especially when epidural anesthesia is combined with general anesthesia. It is recommended that larger concentrations of local anesthetic be used.
